Spring pin



Patented July 8, 1924.

FRANK W. BURPEE, OF CHICAGO, ILLINOIS.

SPRING IIN'.

Application filed November 20, 1922. Serial No. 602,242.

To all whom it may concern:

Be it known that I, FRANK W. BURPEE, a citizen of the Dominion of Canada, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Spring Pins, of which the following is a specification.

This'invention relates to a spring pin designed to offer a yielding resistance to strain imposed on it in a certain direction.

It is particularly designed for use on a hand seaming machine for cans, such as was patented to me with others on the 11th February, 1919, under Patent No. 1,293,694. In

1 that machine the closing of the circumferential cover seam is efiected by rollers applied to the edge of the cover while the same is rotated and supported against the pressure of the seaming rollers by a driving head rotatably mounted in the upper part of the machine on a pin secured in and downwardly projecting from the upper cross member of the frame.

In the machine referred to, to enable the seaming rollers to pass over the multiple thicknesses of the metal of which the can is made, where the circumferential seam of the can cover crosses the vertical seam of the can body, a U bend is introduced in the upper cross rail of the frame between the pin on which the driving head is mounted and the pin which forms the fulcrum of the seaming roller lever.

In the process of manufacture it is found advantageous to make the machine frame of die castings from an alloy having a zinc base, and this material has not such properties of strength and resilience to enab e the U bend to be used.

As a substitute for the U bend in the cross rail of the frame, in such case the driving head is mounted on a spring pm, which is the particular subject of this application. I

The invention is fully described in the following specification, reference being made to the drawings by which it is accompanied, in which:

Fig. 1 is a front; elevation and part section of the machine showing the spring pin 7 on which the driving head is mounted and the relation of the seaming rollers, therewith, and

Fig. 2 is a sectional plan of the same on the line 22 in Fig 1.

Fig. 3 is a detail prespective view of a slightly modified form of the spring pin hereinafter referred to.

In these drawings 2 represents the upper cross member of the frame of the machine, in which the pin 11 is secured, on which the driving head 12 is rotatably mounted and driven by a pinion 10, the teeth of which mesh with teeth 14 formed on the upper side of the driving head 12.

The seaming rollers 23, 2 1, by which the folding and closing of the cover seam of the can are effected, are carried in the end of a handled lever 21 mounted at 25 on one of the columns of the machine frame.

The pin, on which the driving head 12 is mounted, is headed on the lower end and is secured by a pin 16 or other suitable means in an aperture provided for it in the upper frame member 2. In order to alford this pin the required resilience, it is lengthwise split diametrically along its axis, as at 17, from the lower end upward to approximately half the depth of the securing seat of the pin in the frame member 2, with the plane of the split 17 normal to the direction of the strain imposed upon the pin by the acting seaming roller 23 or 24:.

S0 constructed, when, in the operation of seaming the cover of a can, the rollers 23 or 24 encounter the longitudinal seam of the can body, the side of the pin 11 on which the pressure is imposed is free to yield and permit the multiple seam to pass the rollers, while practically the full surface of the pin is retained for the bearing support of the driving head 12.

In Figure 3 is illustrated a slight modification of the spring pin and in the said modified form the pin is provided with a keyway 15 whereby the same may be key held in its proper position.

Although designed to meet an unusual specific requirement, the invention may be more widely applicable.

Having now particularly described my in vention, I hereby declare that what I claim as new and desire to be protected in by 2. A pin, one end of which is secured in Letters Patent, is: a support to project the other end there 10 1. A pin, one end of which is secured in from, which projecting end is lengthwise a support to project the other end theresplit, and means for securing theepin in its 5 from, the outwardly projecting end of the support with the plane of the split norma) pin being lengthwise split with the plane to the imposed strain on the pin. of the split normal to the direction of the In testimony whereof I affix my" signature. applied strain. FRANK WV. BURPEE. 

